how to read javac -prof option?
i want to compare my code after and before optimized
but the javac -prof result is unreadable
too long… and i don’t know how to read it 
There are better commercial tools HPjmeter is free: http://www.hp.com/products1/unix/java/hpjmeter/
It read the file from the JVM so if you keep those files around you can compare your app at different points in time.